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Form validation popups could capture escape key presses. Therefore, spamming form validation messages could be used to prevent users from exiting full-screen mode. This vulnerability affects Firefox < 128 and Thunderbird < 128.

🗓️ 03 Sep 2025 23:12:15Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 5 Views

Form validation popups can capture escape keys to block exiting full-screen mode in Firefox and Thunderbird.

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03 Sep 2025 23:12Current
9.2High risk
Vulners AI Score9.2
CVSS 3.14.3 - 6.3
EPSS0.00342
SSVC
5